Rough service electrical device



A ril 16, 1946. A. 1.. POWELL ETAL 2,398,595

ROUGH SERVICE ELECTRICAL DEVICE Filed Nov. 20, 1944 INVENTORS A. L. Pan24 MI E0B/A/J0 ATTORNEY Patented Apr. 16, 1946 UNITED STATES PATENTOFFICE ROUGH SERVICE ELECTRICAL DEVICE Arthur L. Powell, Tottenville,Staten Island, and William J. Robinson, Baldwin, N. Y., assignors toWestinghouse Electric Corporation, East Pittsburgh, Pa., a corporationof Pennsylvania Application November 20, 1944, Serial No. 564,308

Claims.

This invention relates to electrical devices and, more particularly, tosuch provided with shock-absorbing means adapting them for rough serviceuse. I

The principal object 01' our invention generally considered is toprovide an electrical device, such as a lamp, in which a,shock-absorbing supporting element is disposed between the neck of thebulb and the energy-supplying base, thereby damping shocks which areimpressed on the base and minimizing their effect on the fragileelements in the envelope.

Another object 01' our invention is to provide an electrical device,such as an incandescent electric lamp, with a compressed wire-meshcylinder in which the neck of the envelope nests andis supported, andwhich is in turn connected to the base, to effect a damping action onshocks transmitted to said base, thereby adapting said device for roughservice lamp usage.

Other objects and advantages of the invention will become apparent asthe description proceeds.

Under present condition of modern warfare, with lamps and otherelectrical devices such as radio tubes which are subjected to concussionfrom high power explosives, present means for attaching such devices tothe power supply, such as a base rigidly secured to a lamp bulb andfirmly secured to a socket rigidly mounted on the frame of thebattleship or other fighting vehicle, all too readily transmit the forceof the concussion to the filament and other internal delicate parts. asWell as to the glass or other internal or external supporting members.Thi all too frequently results in the destruction of the lamp or otherdevice at the very moment when it is most needed.

Various attempts have been'made to eliminate or dampen shock transmittedto the bases of such devices, but in most instances the shock absorbingmeans has been disposed in the socket for the devices. This, however,necessitates considerabl expense in replacing all existing sockets.-

Consequently, we propose to provide a rough service energy-translationdevice, such as an incandescent electric lamp, which can be readilyinstalled in any existing socket without expense other than the cost ofthe device itself.

Referring to the scale drawing:

Fig. 1 i a full size elevational view of an electricalenergy-translation device, in the form of an incandescent lamp providedwith shock-absorbing means associated with the base, in accordance withour invention.

Fig. 2 is a vertical sectional view of the base,

shock-absorbing means, and neck portion illustrated in Fig. 1, on anenlarged scale.

Fig. 3 is a Perspective view on an enlarged scale of a shock-absorbingelement of our improved device.

Fig. 4 is a view corresponding to Fig. 2 but showing a modification.

Referring to the drawing in detail, like parts being designated by likereference characters, and first considering the embodiment of ourinvention illustrated in Figs. 1, 2 and 3, there is shown a form ofincandescent electric lamp II which comprises a vitreous envelope l2having suitably mounted therein a conventional filament I3 supplied withelectrical energy through leadin conductors l4 and I5, passing through apress l6 and the st m portion 11 of the envelope.

The customary procedure in lamp manufacture is to cement a, metal basel8 directly to the envelope after fitting it over the outer end of theneck portion thereof. In the present instance, we interpose between thebase l8 and neck IQ of the envelope, 8. wire-mesh cylinder, providingboth axial and radial resiliency which 35 i more than usually effectivefor absorbing shocks, desirably formed of fine brass wire woven whenelongated as indicated at 3! in Fig. 3, and then compressed axially tothe form 2| represented in Fig. 3, where it is likewise a, cylinderhaving a moderately thick wall, of internal dimension snugly receivingthe neck portion is of the envelope l2, to which it is connected in aconventional manner, as by means of basing cement 22. The dimensions ofone embodiment which has been used and is designated 2| in Fig. 1 isabout 1%" outside diameter, 1" inside diameter. and /2" long, but we arenot limited to these dimensions. The shock absorbing cylinder 2| may beof the type manufactured by the Metal Textile Corporation, of 4 CentralAvenue, West Orange, N. J., and designated Lamp shock ring.

. The other, or in this instance th lower, end

oi the cylinder 2|, is desirably seated on and secured to the open endportion of the base Hi. In the present embodiment, the screw-threadedmetal shell 23 of the base It is spaced from the eyelet 26 by glass orother suitable insulation 20, and has an annular extension 24terminating in a short cylinder extension 25, providing an annular seatand protective flange, to which the lower end of the wire mesh cylinderis secured, as by means of solder 28. As is customary, one of the leadssuch as it is secured to the shell 23, in this instance desirablythrough the wire-mesh other numbered II is securedto the customary baseeyelet II, asbymeansotsolder'll.

asinthe Referring now to the embodiment oi our invention illustrated'in- Fig. 4, there is shown aform of incandescent electric lamp H, whichpreceding embodiment, comprises a vitreous envelope is having suitablymounted "therein a conventional filament (not shown) like the filamentII of the preceding embodiment,

s plied with electrical energy through lead-in conductors it and II,passing through a pres (not shown) and the stem portion llof theenvelope.

In the present instance, we interpose between the base II and the neckI! of the envelope, a wire mesh cylinder 2| like that of the precedingembodiment, in one end of which the neck I! snugly fits and is connectedas by basing cement l2, and the other end of which is secured to thescrew threaded metal shell portion 23', as by forming an annularextension 24' on said shell portion, terminating in an elongatedcylindrical portion II in which the mesh cylinder 2 I loosely fits.After placing the cylinder 2i, it may be permanently held in place bybending over the free or upper edge of the cylindrical ortion II, asindicated at It. The lead It is, in thi instance, secured to thebent-over portion 28' as by means of solder II. and'the 1nd I! issecured to the center contact as by means of solder ll".

Fromth foregoingdisclosure,ltwillbeseen that we have provided foreffectively damping the shocks or vibration transmitted from the base tothe envelope oi an electrical device, such as a lamp, radio tube, orother evacuated device, by a woven wire-mesh cylinder, which is adaptedto exert a damping or shock-absorbing action radially as well asaxially, thereby efiectiveiy protecting the fragile elements of thedevice.

Although preferred embodiments of our invention have been disclosed, itwill be understood that modifications may be made within the spirit andscope of the appended claims.

We claim:

1. An electrical device comprising an envelope having fragile elementstherein, a base therefor, and a wire-mesh hollow cylinder of substantialwall thickness for absorbing shocks between said base and envelope, oneend of said envelope fitting within one end of said cylinder, connectedthereto and supported thereby, the other end of said cylinder beingconnected to said base.

2. An electrical device comprising an envelope having a neck andenclosing fragile elements, a base for said device, and a shockabsorbing compressed wire-mesh hollow cylinder of substantial wallthickness within one end of which a portion of said neck nests and isupportingly connected. the other end of 'said cylinder being connectedto said base.

3. An electrical devicecomprising 'an envelope enclosing fragileelements. a base for said device. said base having an extensionproviding an annular seat. a wire-mesh hollow cylinder of substantialwall thickness eng in said seat and connected thereto, the neck of aidenvelope fitting within the free end of said cylinder and supportinglyconnected thereto, to provide for the absorption of shocks transmittedto said base to assasos flu.

prevent them from dam i g the fragile elements in said envelope.

4. An electrical device comprising an envelope enclosing fragileelements, a base for engaging an ene -s p yin sock t. sa d base having acylindrical extension, a compressed wire-mesh hollow cylinder ofsubstantial wall thickness nesting within said extension and in turnsupportingly receiving the neck of said envelope, means cementingsaidneck within said cylinder, and means holding said cylinder in placewithin said extension.

5. An electrical device comprising an envelope having fragile elementstherein, a base therefor, and a hollow wire-mesh cylinder of substantialwall thickness and length for absorbing shocks between said base andenvelope, one end of said envelope fitting within one end of saidcylinder, connected thereto and supported thereby, the other end of saidcylinder being connected to said base.

8. An electrical device comprising an envelope having a neck andenclosing fragile elements, a metal base for said device, and a shockabsorbin compressed wire-mesh hollow cylinder of substantial wallthickness within one end of which a portion of said neck nests and issupport nslv connected, the other end of said cylinder being soldered tothe open end portion of said base.

7. A necked electrical device comprising an envelope enclosing fragileelements, a base for said device, said base'having an extensionproviding an annular seat, a hollow wire-mesh cylinder of substantialwall thickness en ging said seat and soldered thereto, the neck of saidenvelope fitting within the free end of said cylinder and cementedthereto, to provide for the absorption of shocks transmitted to saidbase to prevent them from dam ing the fragile elements in said envelope.

8. An electrical device comprising an envelope enclosing fragileelements a base for engaging an energy-supplying ocket, said base havinga cylindrical extension, a compressed wire-mesh'hollow cylinder ofsubstantial wall thickness nesting loosely within said extension and inturn supportingly receiving the neck of said envelope, means cementingsaid neck within said cylinder, .and overlying flange means on saidextension holding said cy nder in place therewithin.

9. An electrical device comprising'an envelope enclosing fragileelements, a base for said device. said base having an extensionproviding a seat in a transverse plane, a wire-mesh tube of substantialwall thickness and length, having one end engaging said seat and securedthereto, and the neck of said envelope fitting within the other end ofsaid tube and secured thereto, to provide for the absorption of shockstransmitted to said base. as a protection to the fragile elements insaid envelope.

10. An electrical device comprising an envelope enclosing fragileelements, a base for said device, said base having an extension, acompressed wiremesh tube of substantial wall thickness nesting looselywithin said extension and with it outer end receiving the neck of saidenvelope, means securing said neck within said tube, and flange meansoverlying said extension and holding said tube in place therewithin.

- ARTHUR L. POWELL WILLIAM J. ROBINSON.

